/Engine/Source/Runtime/Engine/Public/SparseVolumeTexture/ISparseVolumeTextureStreamingManager.h
Request a frame to be streamed in. FrameIndex is of float type so that the fractional part can be used to better track the playback speed/direction. This function automatically also requests all higher mip levels and adds prefetch requests for upcoming frames.
void Request_GameThread ( [UStreamableSparseVolumeTexture](API\Runtime\Engine\SparseVolumeTexture\UStreamableSparseVolumeTexture) * SparseVolumeTexture, float FrameIndex, int32 MipLevel, bool bBlocking )